A test of general strain theory with Somali refugee youth: a consideration of police, teacher, and family strains

This three-paper dissertation tests whether General Strain Theory (GST) can be helpful in explaining the relationship between strains experienced by refugee youth and youth’s anti-social behaviors such as delinquency and radicalization to violence and what factors mediate the relationship between strain and crime. Additionally, it uses mixed methods combining community meaning-making with quantitative research methods to provide multiple lenses to the issue of youth and negative outcomes. The first chapter presents the context in which Somali refugee youth experiences should be examined as well as relevant literature. The second chapter examines if GST can help us understand the experiences of Somali youth and delinquencies. It examines if three strains (procedural injustice, teacher punishment, and family conflict) are significantly related to crimes against people among this population and if this relationship is mediated by mental health symptoms and marginalization. The results show that both procedural justice and teacher punishment were able to predict crimes against people but the relationship between procedural injustice and crimes against people was fully mediated by mental health symptoms and by marginalization while the relationship between teacher mistreatment and crime remained significant even when mental health symptoms and marginalization were added to the equation. Surprisingly, while the family conflict was highly correlated with both marginalization and mental health symptoms, it was not significantly related to crimes against people. The third chapter applies GST to radicalization to violence among Somali youth. It examines whether three strains (procedural injustice, teacher punishment, and family conflict) predict youth radicalization to violence and whether this relationship is mediated by individual-level factors such as mental health, marginalization and gang attitudes. The analysis shows that only procedural injustice is significantly related to radicalization to violence and that both marginalization and gang attitudes fully mediated the relationship while mental health partially mediated it. The final chapter uses Interpretive Phenomenological Analysis (IPA) to examine community meaning making around youth radicalization. Qualitative interview results show that community members were able to identify important structural, cultural and individual level factors that led to youth radicalization and that many of the factors that they identified such as police and teacher mistreatment and gang presence where similar to the findings in the quantitative research

Black Hole Evaporation in an Expanding Universe

We calculate the quantum radiation power of black holes which are asymptotic to the Einstein-de Sitter universe at spatial and null infinities. We consider two limiting mass accretion scenarios, no accretion and significant accretion. We find that the radiation power strongly depends on not only the asymptotic condition but also the mass accretion scenario. For the no accretion case, we consider the Einstein-Straus solution, where a black hole of constant mass resides in the dust Friedmann universe. We find negative cosmological correction besides the expected redshift factor. This is given in terms of the cubic root of ratio in size of the black hole to the cosmological horizon, so that it is currently of order $10^{-5} (M/10^{6}M_{\odot})^{1/3} (t/14 {Gyr})^{-1/3}$ but could have been significant at the formation epoch of primordial black holes. Due to the cosmological effects, this black hole has not settled down to an equilibrium state. This cosmological correction may be interpreted in an analogy with the radiation from a moving mirror in a flat spacetime. For the significant accretion case, we consider the Sultana-Dyer solution, where a black hole tends to increase its mass in proportion to the cosmological scale factor. In this model, we find that the radiation power is apparently the same as the Hawking radiation from the Schwarzschild black hole of which mass is that of the growing mass at each moment. Hence, the energy loss rate decreases and tends to vanish as time proceeds. Consequently, the energy loss due to evaporation is insignificant compared to huge mass accretion onto the black hole. Based on this model, we propose a definition of quasi-equilibrium temperature for general conformal stationary black holes.Comment: Accepted for publication in Class.Quant.Grav., 18 pages and 3 figure

PENINGKATAN KEMAMPUAN PEMAHAMAN MATEMATIS SISWA KELAS VIII SMP PASUNDAN 9 BANDUNG PADA MATERI PERSAMAAN GARIS LURUS DENGAN MENGGUNAKAN PENDEKATAN KONSTEKTUAL

This research is a classroom action research with descriptive qualitative method, which aims to ilustrate how improved students mathematical understanding abilities when using Contextual Teaching and Learning (CTL) approach to the material of straight line equations. The subjects of this study is 32 students of class VIII-C Junior High School Pasundan 9 Bandung. The instruments used in this study is 5 essay questions that referref to indicators of mathematical understanding ability that is given at the beginning of learning and the end of learning, which is then analyzed by calculating the average of each question indicator. The result of this study indicate that students mathematical understanding ability can be improved using a contextual teaching and learning approach

Dermoscopy of pigmented lesions on mucocutaneous junction and mucous membrane

Author Posting. Copyright (c) The Authors 2009 This is the author's version of the work. It is posted here for personal use, not for redistribution. The definitive version was published in BRITISH JOURNAL OF DERMATOLOGY, volume: 161, issue: 6, pages:1255-1261. https://doi.org/10.1111/j.1365-2133.2009.09251.xBackground The dermoscopic features of pigmented lesions on the mucocutaneous junction and mucous membrane are different from those on hairy skin. Differentiation between benign lesions and malignant melanomas of these sites is often difficult. Objective To define the dermoscopic patterns of lesions on the mucocutaneous junction and mucous membrane, and assess the applicability of standard dermoscopic algorithms to these lesions. Patients and methods An unselected consecutive series of 40 lesions on the mucocutaneous junction and mucous membrane was studied. All the lesions were imaged using dermoscopy devices, analysed for dermoscopic patterns and scored with algorithms including the ABCD rule, Menzies method, 7-point checklist, 3-point checklist and the CASH algorithm. Results Benign pigmented lesions of the mucocutaneous junction and mucous membrane frequently presented a dotted-globular pattern (25%), a homogeneous pattern (25%), a fish scale-like pattern (18 center dot 8%) and a hyphal pattern (18 center dot 8%), while melanomas of these sites showed a multicomponent pattern (75%) and a homogeneous pattern (25%). The fish scale-like pattern and hyphal pattern were considered to be variants of the ring-like pattern. The sensitivities of the ABCD rule, Menzies method, 7-point checklist, 3-point checklist and CASH algorithm in diagnosing mucosal melanomas were 100%, 100%, 63%, 88% and 100%; and the specificities were 100%, 94%, 100%, 94% and 100%, respectively. Conclusion The ring-like pattern and its variants (fish scale-like pattern and hyphal pattern) are frequently observed as well as the dotted-globular pattern and homogeneous pattern in mucosal melanotic macules. The algorithms for pigmented lesions on hairy skin also apply to those on the mucocutaneous junction and mucous membrane with high sensitivity and specificity.ArticleBRITISH JOURNAL OF DERMATOLOGY. 161(6):1255-1261 (2009)journal articl

Simulation of Acoustic Black Hole in a Laval Nozzle

A numerical simulation of fluid flows in a Laval nozzle is performed to observe formations of acoustic black holes and the classical counterpart to Hawking radiation under a realistic setting of the laboratory experiment. We determined the Hawking temperature of the acoustic black hole from obtained numerical data. Some noteworthy points in analyzing the experimental data are clarified through our numerical simulation.Comment: 26 pages, published versio

Non-equilibrium Landauer Transport Model for Hawking radiation from a Black Hole

We propose that the Hawking radiation energy and entropy flow rates from a black hole can be viewed as a one-dimensional (1D), non-equilibrium Landauer transport process. Support for this viewpoint comes from previous calculations invoking conformal symmetry in the near-horizon region, which give radiation rates that are identical to those of a single 1D quantum channel connected to a thermal reservoir at the Hawking temperature. The Landauer approach shows in a direct way the particle statistics independence of the energy and entropy fluxes of a black hole radiating into vacuum, as well as one near thermal equilibrium with its environment. As an application of the Landauer approach, we show that Hawking radiation gives a net entropy production that is 50% larger than that obtained assuming standard three-dimensional emission into vacuum.Comment: 14 pages, 2 figures, published versio

Pemodelan Return Indeks Harga Saham Gabungan Menggunakan Threshold Generalized Autoregressive Conditional Heteroscedasticity (Tgarch)

ARIMA model is one of modeling method that can be applied on time series data. It assumes that the variance of residual is constant. Time series data, particularly the return of composite stock price index, tend to change rapidly from time to time and also fluctuating, which cause heteroscedasticity where the variance of residual is not constant. Autoregressive Conditional Heteroscedasticity (ARCH) or Generalized Autoregressive Conditional Heteroscedasticity (GARCH) can be used to construct model of financial data with heteroscedasticity. Besides of having inconsistent variance, financial data usually shows phenomenon where the difference of the effect between positive error value and negative error value towards data volatility, called asymmetric effect. Therefore, one of the GARCH asymmetric models, Threshold Generalized Autoregressive Conditional Heteroscedasticity (TGARCH) is used in this research to solve heteroscedasticity and asymmetric effect in stock price index return. The data in this research is stock price index return from January 2nd, 2013 until October 30th, 2015. From the analysis, TGARCH models are obtained. ARIMA([3],0,[26])-TGARCH(1,1) is the best model because it has the smallest AIC value compared to other models. It produces the forecast value of stock price index return nearly the same with actual return value on the same day